Bathymetry of Lake Travis

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Presentation transcript:

Bathymetry of Lake Travis Christina Stanard GIS in Water Resources Fall 2006

Background Lake Travis is one of the Highland Lakes, which are formed by six dams on the Colorado River. Lake Travis is a “flood-control” lake which means it is designed to accommodate floodwaters to prevent destruction downstream. It’s neighbors, Lake Marble Falls and Lake Austin, are “constant-level” lakes. Lake Travis has to STORE EXCESS or PROVIDE MORE water so these lakes can remain at constant elevations. This is why the elevation of Lake Travis is ever-changing. Image courtesy of LCRA

Mansfield Dam Lake Travis Lake Austin Elevation when full = 681 ft. Dam Spillway Elevation = 714 ft. Current Elevation = 644.11 ft. From Lower Colorado River Authority: www.lcra.org Lake Austin Mansfield Dam was constructed in 1940 It is 266 feet high. LCRA is reservoir controlling authority. Image courtesy of Google Earth

Purpose Develop a depth chart of Lake Travis according to the current water level Include boat launches and attractions Find the difference in surface area from the change in elevation Lake Travis is a haven for recreational boating. The combination of boating and changing water depths can be deadly. Lake Travis is the “deadliest” lake in Texas partly due to it’s uneven bottom. (kxan.com) Boaters in Devil’s Cove on Lake Travis (Image courtesy of www.nnin.net)

Making the Chart Bathymetric data for the lake, converted to depth the bathymetric data was a text file with x and y coordinates and the corresponding elevation above mean sea level. Edited in EXCEL to convert to depth. The DEM shows the lake Full at 207 meters (or 681 feet) Outline of lake acquired from National Hydrography Dataset (NHD)

Making the Chart Adjusted the depth for the current elevation of 644.1 ft. 2.) in Excel: found depth and then adjusted for the current elevation

Chart of Lake Travis and its Attractions Boat Launches show “open” if the lake elevation is above their minimum operating elevation. Restaurant locations. Coordinates from Google Earth

Zooming in Islands in middle of lake Restaurants are no longer accessible by boat.

Lake Austin and Mansfield Dam Maximum Lake Travis elevation of 681 Feet, Austin is 492 feet. Mansfield Dam currently (Travis at 644 ft.) changes the water elevation 152 feet!! ESRI Satellite Imagery for the background

Future Work Changing Shoreline The surface area of the lake when it is full is 18,929 acres (78 km2) Interested in finding the area when the lake is at the current elevation... Using raster calculation

Improvements More elevation data points for the Lake This data is only 2 points/acre Elevations for boat access to attractions As shown on the zoomed in slide, the data points are too spread out. 100 meters apart.

Questions?